Thursday, July 21, 2022

VARA function [MS]

Estimates variance based on a sample. In addition to numbers, text and logical values such as TRUE and FALSE are included in the calculation.

Syntax

VARA(value1,value2,...)

Value1,value2,...     are 1 to 30 value arguments corresponding to a sample of a population.

Remarks

• VARA assumes that its arguments are a sample of the population. If your data represents the entire population, you must compute the variance using VARPA.

• Arguments that contain TRUE evaluate as 1; arguments that contain text or FALSE evaluate as 0 (zero). If the calculation must not include text or logical values, use the VAR function instead.

• VARA uses the following formula:

Example

Suppose 10 tools stamped from the same machine during a production run are collected as a random sample and measured for breaking strength.

 St1 St2 St3 St4 St5 St6 St7 St8 St9 St10 Formula Description (Result) 1345 1301 1368 1322 1310 1370 1318 1350 1303 1299 =VARA([St1], [St2], [St3], [St4], [St5], [St6], [St7], [St8], [St9], [St10]) Estimates the variance for the breaking strength (754.2666667)

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